Pen



FIG. 1 shows a bottom perspective view of the pen.

FIG. 2 shows a top perspective view thereof.

FIG. 3 shows a right side elevation view thereof.

FIG. 4 shows a front elevation view thereof.

FIG. 5 shows a left side elevation view thereof.

FIG. 6 shows a rear elevation view thereof.

FIG. 7 shows a top plan view thereof; and,

FIG. 8 shows a bottom plan view thereof. 

CLAIM The ornamental design for a pen, as shown and described. 